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Message * Articles On Hp Calculators, including Hp-48 Series, Hp-49 Series, Hp-35, Hp-65, Rpl (programming Language), Hp 33s, Hp-41c, Hp-41 Extension Module, Focal (hp-41), Hp-20s, Hp-42s, Hp-10b, Hp-38g, Hp-40g, Hp-18c, Hp-22s, Hp-32s - 1242604480 - 9781242604485